Two press grinder constructed for easy wheel replacement

ABSTRACT

The specification discloses a two press grinder, especially for grinding wood, in which a grindstone, or grinding wheel, is supported on a horizontal shaft in the machine frame and between opposed press boxes which press the material, namely, wood, against the periphery of the grindstone to be ground thereby. According to the present invention, the frame of the machine is so constructed that the side walls of the frame, and all operative parts of the machine disposed in the regions above the grindstone, can be detached from the machine frame and lifted as a unit thereby completely exposing the grindstone from above for easy replacement thereof.

United States Patent Thumm et a1.

[54] TWOPRESS GRINDER CONSTRUCTED 526,043 9/1894 Merrill ..241/285 B FOR EASY WHEEL REPLACEMENT 1,114,031 10/1914 Pelton ..24l/285 B [72] Inventors: Helmt Thumm; willy Schaich, 2,381,775 8/1945 Roddy ..24 l/285 A both of Heidenheim, Germany Primary Examiner-Robert L. Sprmll [73] Assrgnee: J. M. Voith, GmbH, l-leldenhelm Atmmey Melvin Crosby Brenz), Germany [22] Filed: Nov. 25, 1970 ABSTRACTv [21] Appl. No.: 92,584 The specification discloses a two press grinder, especially for grinding wood, in which'a grindstone, or grinding wheel, is supported on a horizontal shaft in [30] Foreign Apphcafion Pnomy Data the machine frame and between opposed press boxes Dec. 6, 9 Germany 19 61 309-3 which press the material, namely, wood, against the periphery of the grindstone to be ground thereby. Ac- U-S. A cording to the resent invention the frame of the [51] Int. Cl. ..B02c 19/00 machine is so constructed that the i Walls Of th=7 [58] Field of Search..241/ 136, 151, 280, 282, 285 A, frame and an operative parts of the machine disposed 241/285 B; 144/ in the regions above the grindstone, can be detached from the machine frame and lifted as a unit thereby [56] References Cited completely exposing the grindstone from above for UNITED STATES PATENTS easy replacement. thereof.

721,039 2/1903 Hazelton ..241/ 151 5 Claims, 2 Drawing Figures 27 I l 2 I l Q 1/20 r o 30 :00 M; 0 30 E o i l o o 23 ii 5 f7 EZ J";//] 74 25 l s 7 L24 "0 sv%7 9/ :a/p j :;"0 o a 51 Sept. 12, 1972 P'A'IE'NTED SEP 12 m2 FIG.1

a 0v 0 00a INVENTOR. HELM T THUMM BY WH-LY HFHCH TWO PRESS GRINDER CONSTRUCTED FOR EASY WHEEL REPLACEMENT The present invention relates to a two press grinder, especially for the production of ground wood.

Two press grinders of the general nature of which the present invention is concerned are known and comprise a frame having a rotor therein comprising a horizontal shaft on which is mounted a grinding wheel, or grindstone, and against which the wood to be ground is pressed from opposite sides thereof by two press box arrangements.

A grinder of the nature referred to comprises certain auxiliaries such as spray pipes and collecting gutters and a dressing device which are normally positioned in the region above the grindstone. Thus, when it becomes necessary to exchange the grindstone, these accessories and auxiliaries must be removed from the machine to expose the grindstone so that it can be lifted out from the frame of the machine together with the shaft on which it is mounted.

It is known, as disclosed in the German publication, Das Papier 1967, No. 10, page 14, to construct the side walls of the frame of a grinder of the nature referred to from two large portions which come together in the region of the axis of the shaft of the grinder. Directly above the shaft is inserted a small wall section disposed between the larger wall portions so that the small section can be removed to provide clearance somewhat greater than the diameter of the shaft whereby the rotor of the grinder can be lifted upwardly, availing of the slots left in the side walls upon the removal of the aforementioned small sections.

In the case of a machine of this nature, however, there still remain a great number of pieces and accessories and auxiliaries of the grinder which are-above the horizontal plane of the axis of the shaft of the machine and which must be removed before the rotor of the machine can be lifted out. Such accessories, comprise for example, the fingerplate supports and the fingerplates thereon which form the upper limits of the press boxes arranged on opposite sides of the grindstone and which terminate adjacent the periphery of the grindstone.

Further, the accessories include spray pipes, a collecting gutter for the ground material, and a wheel dressing device for dressing the periphery of the grindstone. Still further, at the ends, or side, surfaces of the grindstone, are grooved plates carried on the lateral walls of the frame of the machine which prevent pieces of wood from slipping down between the ends of the grindstone and the lateral walls of the frame. Those portions of the grooved plates which are located above the horizontal plane of the axis of the shaft also interfere with the removal of the rotor because they extend into the axial region occupied by the discs on'the shaft at the opposite ends of the grindstone which locate and secure the grindstone to the shaft.

From the foregoing, it will be appreciated that the disassembling of the aforementioned accessories and parts to remove the rotor from the machine and the subsequent reassembling of the said parts and accessories after the rotor has been placed back into the machine means that the exchange of a machine rotor calls for considerable labor and a substantial amount of down-time of a machine during which the machine is not producing.

With the foregoing in mind, a primary objective of I the present invention is the provision of a two press grinder construction wherein the exchanging of the rotor of the machine can be accomplished in a much more simple manner than has heretofore been possible and in a much more rapid manner.

The exact nature of the present invention will become more apparent upon reference to the following detailed specification taken in connection with the accompanying drawings, in which:

FIG. 1 shows a two press grinder in operative assembled condition, partially as a side elevational view, and partially as a longitudinal section; and

FIG. 2 shows the same two press grinder in side elevation, but-with a structural unit forming a center portion of the housing being lifted upwardly to expose the rotor of the machine. I

BRIEF SUMMARY OF THE INVENTION According to the present invention, a two press grinder is so constructed that the assembling and disassembling work required for the exchange of the grindstone thereof will be simpler and more rapid to perform than has heretofore been possible. This result is accomplished by forming the side walls of the frame, or hous ing, of the grinder in two parts which meet in the horizontal plane of the axis of the shaft which supports the grindstone and by rigidly interconnecting the upper ones of the parts of the side walls on the opposite of the machine with each other and by securing to the interconnected upper side wall parts, the accessories of the grinder which are located above the aforementioned horizontal plane. Such accessories include the grooved side plates positioned closely adjacent the ends, or side faces, of the grindstone, the collection gutter or trough for the ground material, spray pipes, fingerplates and supports therefor, and the like. With the upper portions of the two side walls rigidly interconnected and with the accessories above referred to secured thereto, all of these parts can be removed as a unit merely by unbolting the upper side wall parts from the lower side wall parts. The result of constructing the housing of the grinder in the aforementioned manner is that the disassembling of the frame of the grinder to expose the grindstone for exchange is quite simple, as is likewise the reassembling of the grinder after a new grindstone has been put in place.

DETAILED DESCRIPTION The two press grinder shown in the drawings has a frame, or housing, with a rotor therein comprising a grindstone, or grinding wheel, 10, mounted on a shaft 11 and with discs or flanges 12, serving in a known manner for the clamping of the grindstone upon the shaft. The shaft 11 extends laterally of the grinder frame, or housing, and extends through the side walls of the frame on both sides and is carried by bearings which may be carried by the side walls but which are preferably located outside the housing and which are not shown in the drawings.

Furthermore, the grinder is equipped with two press boxes 14 which are arranged in regions of the grindstone periphery which lie diametrically opposite each other. The longitudinal axes of the press boxes, in the typical example shown in the drawings, are arranged horizontally but they could also be inclined towards the horizontal at a certain angle, to form a V-like arrangement.

Each one of the press boxes 14 is limited on the bottorn by the horizontally shiftable bottom plate 15 which carries a fingerplate 16. Each plate 15 is adjustable to compensate for wear of the grindstone. At the sides, the press boxes are limited by the lateral side walls of the machine which are subdivided into several portions, or parts, l7, l8, 19, while at the top, the feed boxes are limited by the movable valve plates 21, each of which forms part ofv the respective feed chute 20.

Each of the feed boxes are also limited at the top by a respective upper fingerplate 22 and the fingerplate support 23. The fingerplate supports 23 are connected to the central, upper, portions 19 of the side walls to permit the supports to be shifted horizontally as the grinding wheel wears.

The ends of the feed boxes remote from the grinding wheel are confined by the pressure members 25 which are actuated by the double acting fluid motors 24 and serve to press the wood to be ground against the peripheral surface of the grindstone 10.

The central, upper, portion 19 of the two lateral, or side, walls, are rigidly connected to each other by two transverse bars, or beams, 26, and carry a gutter 27 which catches fibrous matter and passes it along towards the sides of the frame of the grinder, and also carry the upper spraying pipes 28, the grindstone dressing device 29 and the walls 30 of the feed chutes which face the vertical plane of the axis of shaft 1 1.

Furthermore, the upper grooved plates 31 at the ends of the grindstone are attached to the internal faces of the central, upper, portions 19 at the inner ends of the press boxes 14. The lower grooved plates 32, and the lower spraying pipes 33, however, are attached to the lowerportions 17 of the lateral, or side, walls of the machine frame, or housing.

FIG. 2 shows how the structural unit consisting of the central, upper, portions 19 of the side walls and the transverse beams 26 rigidly connecting portions 19 with each other, together with all of the aforementioned accessories 22, 23, 27, 28, 29, 30, 31 carried by the structural unit can be lifted from the frame of the machine so as to render it possible to remove the rotor consisting of parts 10, 11, 12 in a simple and unimpeded manner.

The portions 19 of the lateral walls are constructed so as to be essentially rectangular when viewed axially of shaft 11, and are, preferably, symmetrical about the vertical plane of the axis of the shaft 11. The lower edge each of wall portions 19 is preferably disposed in the horizontal plane of the axis of shaft 11. Construction of wall portions 19 in the described manner great simplifies the production thereof and the fitting together of the individual portions of the side walls of the frame of the grinder.

The lateral edges of the portions 19 of the side walls of the frame are disposed adjacent the'feed chutes 20 and are, preferably, vertical. It is of advantage for the walls 30 of the feed chutes 20 which face toward the vertical plane of the axis of shaft 11, to be attached to the central wall portions 19 to form a part of the aforementioned structural unit so as to be movable he orementioned structural umt is, of course, bolted securely to the stationary part of the grinder frame when in place thereon and the bolts are removed to permit the unit to be lifted upwardly to expose the rotor.

Lifting of the aforementioned structure unit can readily be accomplished by availing of eye bolts on top of the unit which can be engaged bylifting hooks, or by cables, or the like.

Modifications may be made within the scope of the appended claims.

What is claimed is:

1. In a two press grinder for grinding wood; a frame having side walls, a horizontal shaft extending transversely of the frame and through both of said side walls and having a grindstonethereon between said side walls, each said side wall being formed of portions separable substantially along the horizontal plane of the axis of said shaft, the lower portion of each side wall being stationary and the upper portion thereof being liftable upwardly from the said lower portion, means fixedly interconnecting the said upper side wall portions for lifting and lowering movement thereof as a unitary structure, said grinder comprising accessories cooperating with said grindstone during operation of said grinder and those of said accessories located above said plane being carried by the said unitarystructure formed by said interconnected upper side wall portions so as to be liftable together therewith whereby said grindstone is completely exposed from above when said unitary structure is lifted from said frame, said grinder also comprising feed chutes disposed on opposite sides of the vertical plane of the axis of said shaft for the supply of wood to be ground to opposite sides of said grindstone, each said upper portion of said sidewalls having vertical side edges disposed at the sides of said chutes nearest said grindstone.

2. A two press grinder according to claim 1 in which each said feed chute has an upstanding wall on the side facing the other chute, said upper side wall portion being substantially symmetrically formed relative to said vertical plane and each extending to and being connected with the said upstanding walls of said chutes.

3. A two press grinder according to claim 1 which includes beam members extending transversely of said frame, said means fixedly inter-connecting said side wall portions parallel to said shaft and fixedly connected at the ends to said upperside wall portions.

4. A two press grinder according to claim 3 in which said beam members are disposed'near the corners of said upper side wall portions portions which are disposed at the juncture of said vertical side edges and the top edges thereof.

5. A two press grinder according to claim 2 in which said upstanding walls of said chutes are substantially vertical and parallel to said vertical plane of the axis of said shaft and are disposed substantially in the planes of said side edges of said upper wall portions. 

1. In a two press grinder for grinding wood; a frame having side walls, a horizontal shaft extending transversely of the frame and through both of said side walls and having a grindstone thereon between said side walls, each said side wall being formed of portions separable substantially along the horizontal plane of the axis of said shaft, the lower portion of each side wall being stationary and the upper portion thereof beinG liftable upwardly from the said lower portion, means fixedly interconnecting the said upper side wall portions for lifting and lowering movement thereof as a unitary structure, said grinder comprising accessories cooperating with said grindstone during operation of said grinder and those of said accessories located above said plane being carried by the said unitary structure formed by said interconnected upper side wall portions so as to be liftable together therewith whereby said grindstone is completely exposed from above when said unitary structure is lifted from said frame, said grinder also comprising feed chutes disposed on opposite sides of the vertical plane of the axis of said shaft for the supply of wood to be ground to opposite sides of said grindstone, each said upper portion of said side walls having vertical side edges disposed at the sides of said chutes nearest said grindstone.
 2. A two press grinder according to claim 1 in which each said feed chute has an upstanding wall on the side facing the other chute, said upper side wall portion being substantially symmetrically formed relative to said vertical plane and each extending to and being connected with the said upstanding walls of said chutes.
 3. A two press grinder according to claim 1 which includes beam members extending transversely of said frame, said means fixedly inter-connecting said side wall portions parallel to said shaft and fixedly connected at the ends to said upperside wall portions.
 4. A two press grinder according to claim 3 in which said beam members are disposed near the corners of said upper side wall portions portions which are disposed at the juncture of said vertical side edges and the top edges thereof.
 5. A two press grinder according to claim 2 in which said upstanding walls of said chutes are substantially vertical and parallel to said vertical plane of the axis of said shaft and are disposed substantially in the planes of said side edges of said upper wall portions. 